The invention relates to a light receiving unit (EM) having a first energy source (VQ1) consisting of two sub-sources (TQ1, TQ2), each of which is designed as a current source or a voltage source. A first connection contact (VSUP1) is formed on the upper face of the first sub-source (TQ1), and a second connection contact (VSUP2) is formed on the lower face of the second sub-source (TQ1). Each sub-source (TQ1, TQ2) has at least one semiconductor diode (D1, D2), wherein the first semiconductor diode (D1) has an absorption edge adapted to a first light wavelength (L1), and the second semiconductor diode (D2) has an absorption edge adapted to a second light wavelength (L2) which differs from the first light wavelength (L1) such that the first sub-source (TQ1) generates an electric voltage upon being irradiated with the first light wavelength (L1) and the second sub-source (TQ2) generates an electric voltage upon being irradiated with the second light wavelength (L2). The first semiconductor diode (D1) is connected in series so as to have the opposite polarization of the polarization of the second semiconductor diode (D2) such that the voltages generated by the first and the second semiconductor diode (D1, D2) at least partly compensate for each other.